feat: add explanation for context menu functionality (#486)

README.md

@@ -15,7 +15,7 @@ The benefits of removing tracking parameters are:
 - Improves readability of links
 - Saves characters (in Tweets for example)
 
-<img src="etc/painting_mondstern.jpg" width="400" />
+<img src="./etc/painting_mondstern.jpg" width="400" />
 
 _Painting by [Mondstern](https://mastodon.green/@mondstern/111993655182793928) (CC BY-SA)_
 
@@ -31,6 +31,11 @@ Cleaner share the cleaned URL to the actual target application.
 
 <img src="./app/src/main/res/drawable-nodpi/howto_pixel_5.webp" width="250" />
 
+It's also possible to select editable text in any application which supports it, then in the
+context menu choose Léon to sanitize text in place.
+
+<img src="./etc/context_menu.png" />
+
 ## Issues & feedback
 
 Did you find a bug or have an idea of how the app could be improved? Please report
@@ -39,7 +44,8 @@ Did you find a bug or have an idea of how the app could be improved? Please repo
 
 ## API
 
-It is possible to call Léon programmatically from other applications. See [API.md](./API.md) for details.
+It is possible to call Léon programmatically from other applications. See [API.md](./API.md) for
+details.
 
 ## Technical implementation
 

app/src/main/res/values-de/strings.xml

@@ -26,7 +26,7 @@
     <string name="clipboard_message">Link in Zwischenablage kopiert</string>
     <string name="clipboard_empty_message">Zwischenablage ist leer</string>
     <string name="how_to_title">Anleitung</string>
-    <string name="how_to_text">Wähle die App \"URL Cleaner\" beim Teilen von Text aus. Klicke anschließend in dieser App auf \"Teilen\", um den Text an die Ziel-App zu schicken. Alternativ, klicke die Schaltflächte oben, um den Inhalt aus der Zwischenablage zu importieren.</string>
+    <string name="how_to_text">Wähle die App \"URL Cleaner\" beim Teilen von Text aus. Klicke anschließend in dieser App auf \"Teilen\", um den Text an die Ziel-App zu schicken. Alternativ, klicke die Schaltflächte oben, um den Inhalt aus der Zwischenablage zu importieren.\n\nEs ist auch möglich editierbaren Text in einer App auszuwählen und anschließend in dem Kontextmenü Léon zu wählen, um den Text and Ort und Stelle zu reinigen.</string>
     <string name="cleaned_url">Gesäuberte URL</string>
     <string name="original_url">Original URL</string>
     <string name="sanitizers">Reiniger</string>

app/src/main/res/values/strings.xml

@@ -27,7 +27,7 @@
     <string name="clipboard_message">Link copied to clipboard</string>
     <string name="clipboard_empty_message">Clipboard is empty</string>
     <string name="how_to_title">How-to</string>
-    <string name="how_to_text">When sharing text, choose \"URL Cleaner\". Then click on \"Share\" in this app to send text to target app. Alternatively, click the button above to import contents from the clipboard.</string>
+    <string name="how_to_text">When sharing text, choose \"URL Cleaner\". Then click on \"Share\" in this app to send text to target app. Alternatively, click the button above to import contents from the clipboard.\n\nIt\'s also possible to select editable text in an application, then in the context menu choose Léon to sanitize text in place.</string>
     <string name="cleaned_url">Cleaned URL</string>
     <string name="original_url">Original URL</string>
     <string name="sanitizers">Sanitizers</string>